If you are following a low-carb diet it's likely that eggs are an important source of protein and healthy fats.
But too many eggs too often will scupper fat loss because it depletes levels of biotin (vitamin B7). Eggs contain a compound called avidin, which binds with biotin in your body, rendering it unusable. A single molecule of avidin binds with four molecules of biotin.
Biotin is responsible for gluconeogenesis - fat mobilisation - and leucine metabolism. A deficiency results in excess circulatory leucine, which in turn depletes an important vitamin precursor called pyrodoxine, which is needed for multiple hormonal production pathways, especially serotonin.
If you are on a low-carb diet serotonin production will be low already, so too many eggs will exacerbate this problem, reducing your body's ability to burn fat and lowering mood.
Think before you eat, because every nutrition plan has its potential setbacks.